Description
A vulnerability was found in saitoha libsixel up to 1.10.3. Affected by this issue is the function sixel_debug_print_palette of the file src/encoder.c of the component img2sixel. The manipulation results in stack-based buffer overflow. The attack must be initiated from a local position. The exploit has been made public and could be used. The patch is identified as 316c086e79d66b62c0c4bc66229ee894e4fdb7d1. Applying a patch is advised to resolve this issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| saitoha | libsixel | 1.10.0, 1.10.1, 1.10.2, 1.10.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libsixel | 1:1.8.7-1 | — |
| Debian 13 | libsixel | No fix yet | — |
| Debian 12 | libsixel | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libsixel | No fix yet | — |
| Ubuntu 26.04 LTS | libsixel | No fix yet | — |
| Ubuntu 25.10 | libsixel | No fix yet | — |
| Ubuntu 24.04 LTS | libsixel | No fix yet | — |
| Ubuntu 22.04 LTS | libsixel | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | libsixel | No fix yet | — |
| Ubuntu 18.04 LTS | libsixel | No fix yet | — |
| Ubuntu 16.04 LTS | libsixel | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libsixel | 1.10.5-2.1 | openSUSE-SU-2025:15526-1 |
Advisories 1
- openSUSE-SU-2025:15526-1 libsixel-bash-completion-1.10.5-2.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
References
- VDB-320905 | saitoha libsixel img2sixel encoder.c sixel_debug_print_palette stack-based overflow vdb-entry technical-description
- VDB-320905 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- Submit #632366 | LibSixel img2sixel LibSixel version 1.10.3 (commit 6dd664c) compiled on Aug 2 2025 and the newest master version. Heap Buffer Overflow third-party-advisory
- https://github.com/saitoha/libsixel/issues/200 issue-tracking
- https://github.com/saitoha/libsixel/issues/200#issuecomment-3178785635 issue-tracking
- https://drive.google.com/file/d/1IIvvRFgUQZcySqeoqXXhsxd0HZCjClJ7/view?usp=sharing exploit
- https://github.com/saitoha/libsixel/commit/316c086e79d66b62c0c4bc66229ee894e4fdb7d1 patch